<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <script type="text/javascript">
        function fn(ele1,ele2,ele3,ele4){
            console.info(ele1 +","+ ele2 +","+ ele3 /*+","+ ele4*/  );
            console.info();
        }

        var numb = [1,2,3,4];
        numb.forEach(fn);

        var y =2;
        var y =5;
        console.info(undefined ||1);
        console.info('0' == '0');
    </script>
</head>
<body>

</body>
</html>